After Clara Oswald located the Twelfth Doctor in Essex in 1138, Missy slapped a vortex manipulator on her. Slaved to Missy's own, the device allowed Clara to travel with Missy to Essex.
When Clara was fired upon by Dalek control, (TV: The Magician's Apprentice) the manipulator used the energy from the gunstick blasts to recharge and teleport Clara to safety, although Missy noted that this had destroyed its functionality. (TV: The Witch's Familiar)
In 2049, the Doctor asked Clara and Courtney Woods if they still had their vortex manipulators before saying that he'd run them both home without waiting for an answer. (TV: Kill the Moon [+]Peter Harness, Doctor Who series 8 (BBC One, 2014).)